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| == iKAGRA ETM suspension Preparation; Current status == | = Type-C (TAMA) suspension = |
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| ==== Schedule ==== 12th- (2 weeks) Disassembling and Washing (favorable) 25th- (2 weeks) Assembling and Hanging 1th Feb- coil winding, transportation to the End, installation test 7th Feb- check 15th installation |
Type-C suspension is a relatively small double pendulum with intermediate mass passively damped by eddy current damping. Some of the type-C suspensions which are used in KAGRA were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension. *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Note by K. Arai(2014)]] Type-C can be roughly divided into 2 types. One is PO (Pick-off) type which suspends the mirror with the thickness of about '''3cm'''. The other is TM(test mass) type which suspends the mirror with the thickness of about '''6cm'''. == iKAGRA == In 2017, 5 Type-C suspensions were installed in iKAGRA.<<BR>> In the final iKAGRA configuration, 7 mirrors were suspended and 6 of them were Type-C. === Mode Cleaner suspensions === The thickness of the mode cleaner mirrors are about 3cm. For these mirrors PO(Pick-off) type suspension are used. |
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| ==== Disassembling at Mitaka[Ohishi] ==== finished. (12th-19th) [problem] * 2 nuts stuck: solved by Hirata-san * A Cu screw stuck: solved by Hirata-san ==== Washing [Hirata-san] ==== most of the parts were washed. [problem] * ultra sonic washer broken 20th ordered on 22th(Fri) will be arrive at Mitaka on 26th(Tue) * 8 screws for adjusting the IM holding plate was dirty Solution: order new screws (not ordered yet) ==== Missing parts ==== * coil bobbin [Takahashi-san] * coil winding [students of Ando-lab] * D-sub fixture plates [Takahashi-san] * mirror container [Tatsumi-san] * magnets for dummy mirror (4 ; 2-phi-L-5mm Nd magnets) [Ohishi] * some screws in replace with Cu screws [Ohishi] ==== pico-motors and PZTs ==== |
Mode cleaner suspensions will be used for long term even after the iKAGRA. Nakano-san installed MC_i, MC_e, and MC_o. The thickness of the MC mirrors are about 3cm. This type of the is called as PO(pick-off). |
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| ==== coil driver ==== | === Temporary mirrors === The others were TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter. Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. |
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| ==== cables ==== | * ETM Transfer function * long term drift |
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| ==== Assembling ==== On 21th, suspension frame, security frame, xy stages completed [Tomaru] |
== bKAGRA == *Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA. [[KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] *[[KAGRA/Subgroups/VIS/Type-C/IMMT|IMMT Preparation]] |
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| ==== Hanging ==== |
*[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] |
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| ==== Transfer Function Measurement ==== | === Drawings === *[[KAGRA/Subgroups/VIS/Type-C/OSEM|OSEM]] *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]] *Magnet and standoff fixture jig *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|IMC_suspension]] |
Type-C (TAMA) suspension
Type-C suspension is a relatively small double pendulum with intermediate mass passively damped by eddy current damping. Some of the type-C suspensions which are used in KAGRA were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension.
Type-C can be roughly divided into 2 types. One is PO (Pick-off) type which suspends the mirror with the thickness of about 3cm. The other is TM(test mass) type which suspends the mirror with the thickness of about 6cm.
iKAGRA
In 2017, 5 Type-C suspensions were installed in iKAGRA.
In the final iKAGRA configuration, 7 mirrors were suspended and 6 of them were Type-C.
Mode Cleaner suspensions
The thickness of the mode cleaner mirrors are about 3cm. For these mirrors PO(Pick-off) type suspension are used.
Mode cleaner suspensions will be used for long term even after the iKAGRA. Nakano-san installed MC_i, MC_e, and MC_o. The thickness of the MC mirrors are about 3cm. This type of the is called as PO(pick-off).
Temporary mirrors
The others were TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter.
Work log about 2 iKAGRA ETMs is here.
- ETM Transfer function
- long term drift
bKAGRA
- Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA.
Drawings
- Magnet and standoff fixture jig